Use netlify functions

.netlify/functions-serve/graphql/graphql.js

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+module.exports = require('./src/netlify/functions/graphql/graphql.js')

.netlify/functions-serve/graphql/package.json

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+{"type":"commonjs"}

.netlify/functions-serve/graphql/src/schema.graphql

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+type Country @key(fields: "code") {
+  code: ID!
+  name: String!
+  native: String!
+  phone: String!
+  continent: Continent!
+  capital: String
+  currency: String
+  languages: [Language!]!
+  emoji: String!
+  emojiU: String!
+  states: [State!]!
+}
+
+type Continent @key(fields: "code") {
+  code: ID!
+  name: String!
+  countries: [Country!]!
+}
+
+type Language @key(fields: "code") {
+  code: ID!
+  name: String
+  native: String
+  rtl: Boolean!
+}
+
+type State {
+  code: String
+  name: String!
+  country: Country!
+}
+
+input StringQueryOperatorInput {
+  eq: String
+  ne: String
+  in: [String]
+  nin: [String]
+  regex: String
+  glob: String
+}
+
+input CountryFilterInput {
+  code: StringQueryOperatorInput
+  currency: StringQueryOperatorInput
+  continent: StringQueryOperatorInput
+}
+
+input ContinentFilterInput {
+  code: StringQueryOperatorInput
+}
+
+input LanguageFilterInput {
+  code: StringQueryOperatorInput
+}
+
+type Query {
+  countries(filter: CountryFilterInput): [Country!]!
+  country(code: ID!): Country
+  continents(filter: ContinentFilterInput): [Continent!]!
+  continent(code: ID!): Continent
+  languages(filter: LanguageFilterInput): [Language!]!
+  language(code: ID!): Language
+}